The total energy of revolving electron in an atom A. Cannot be negative B. Can have any value above zero C. Can never be positive D. Will always be positive

The correct answer is: A. Cannot be negative.

An electron in an atom can have any value of energy above zero, but it cannot have a negative energy. This

is because the electron is bound to the atom by the electric force, and the electric force always attracts the electron to the nucleus. If the electron had a negative energy, it would be repelled by the nucleus and would fly away from the atom.

Option B is incorrect

because the electron can have any value of energy above zero. Option C is incorrect because the electron can have a positive energy. Option D is incorrect because the electron cannot have a negative energy.